Steel Bank Common Lisp

About

Steel Bank Common Lisp (SBCL) is a high performance Common Lisp
compiler. It is open source / free software, with a permissive license. In
addition to the compiler and runtime system for ANSI Common Lisp, it provides
an interactive environment including a debugger, a statistical profiler, a
code coverage tool, and many other extensions.

SBCL runs on a number of POSIX platforms, and experimentally on Windows. See the download page for supported platforms, and getting started guide for additional help.